According to NYT, former President Jimmy Carter visited Cuba twice after he left office, in 2002 and 2011. President Obama’s visit today is the first visit by a sitting president in 88 years. In January 1928, President Calvin Coolidge attended the Pan American Conference in Havana. He rode the presidential railcar to Key West and then boarded the battleship USS Texas and set sail for Havana. This is also a first for Air Force One.